January Weather in Castanhal, Brazil

Last updated: August 22, 2025

In January, the average temperature in Castanhal, Brazil reaches a pleasant 26°C (79°F), with lows dipping to 21°C (71°F) and highs soaring up to 34°C (93°F). However, be prepared for the rainy season, as precipitation totals about 265 mm (10.4 in) over 24 days, creating a backdrop of lush greenery. With an average humidity of 89%, the air is notably moist, adding to the tropical allure of this enchanting destination.

January Temperature in Castanhal

In January, in Castanhal, the average temperature is 26°C (79°F). The maximum can reach 34°C (93°F) and the minimum can be as low as 21°C (71°F). This pleasant weather makes Castanhal an ideal destination for travelers seeking warmth and comfort.

January Weather in Castanhal: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Castanhal, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Castanhal, January typically has an average temperature of 26°C (79°F), with highs reaching up to 34°C (93°F) and lows dropping to around 21°C (71°F).

Data source: Temperature data for Castanhal generated using information from the Copernicus Climate Change Service.

January Precipitation in Castanhal

In Castanhal in January, the total precipitation amount reaches 265 mm (10.4 in), occurring over the span of 24 days.

January Precipitation Trends in Castanhal

The chart displays monthly precipitation patterns in Castanhal, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Castanhal, January typically receives around 265 mm (10.4 inches) of precipitation spread over approximately 24 days.

Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

January Humidity in Castanhal

In Castanhal in January, humidity is 89%. With an average temperature of 26°C (79°F), this humidity feels like walking through a warm, thick blanket, making it feel much hotter and more exhausting for traveling, as every step seems to weigh you down in the muggy air.

January Average Humidity in Castanhal

This chart illustrates the average monthly humidity levels in Castanhal, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Castanhal is approximately 89%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Castanhal

In Castanhal in January, the maximum UV index is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in Castanhal, you can check here.

Maximum UV Index Levels in Castanhal for January

The chart shows the monthly maximum UV Index (UVI) for Castanhal in January, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In January, the maximum UV index in Castanhal typically reaches 14, which falls under the extreme exposure category.

Data source: Castanhal January UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How January Weather in Castanhal Compares to Other Months

Weather in Castanhal varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Castanhal, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Castanhal, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	26°C (79°F)	265 mm (10.4 inches)	89%	extreme
February Weather	26°C (79°F)	525 mm (20.7 inches)	81%	extreme
March Weather	26°C (79°F)	535 mm (21.1 inches)	81%	extreme
April Weather	26°C (79°F)	445 mm (17.5 inches)	85%	extreme
May Weather	26°C (80°F)	350 mm (13.8 inches)	89%	extreme
June Weather	27°C (80°F)	132 mm (5.2 inches)	86%	extreme
July Weather	27°C (80°F)	86 mm (3.4 inches)	81%	extreme
August Weather	27°C (81°F)	56 mm (2.2 inches)	72%	extreme
September Weather	28°C (82°F)	53 mm (2.1 inches)	69%	extreme
October Weather	28°C (83°F)	58 mm (2.3 inches)	69%	extreme
November Weather	28°C (82°F)	98 mm (3.9 inches)	71%	extreme
December Weather	27°C (81°F)	202 mm (8.0 inches)	82%	extreme